NJI,
Quote
can anyone explain the hazards of running a 4wire subfeed 120/240 AND puting in ground rods. Other than the fact that you shouldn't i'd like to brush up on the theory behind it.
Who told you that you shouldn't do both? If the sub panel is at a second building and you pull an EGC, the code requires a grounding electrode system at the second building.
Don

Don(resqcapt19)